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// Other services

Port 3166: Quest Spotlight Out-Of-Process Collector

Port 3166 is assigned by IANA to sossecollector (Quest Spotlight Out-Of-Process Collector).

3166

How sossecollector works

Other services
client:3166sossecollectorresponse client:3166sossecollectorresponse

The client sends a request to port 3166 and the sossecollector service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3166 dangerous?

We have no specific security note for port 3166. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3166

ServicePortTransportDescriptionReferenceUpdated
sossecollector 3166 TCP, UDP Quest Spotlight Out-Of-Process Collector - 2008-10-23

// source: IANA service name and port number registry

03 Check it

Which program uses port 3166, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3166'      # process listening on 3166
sudo lsof -nP -i :3166

macOS

sudo lsof -nP -i :3166

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3166 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3166
netstat -ano | findstr :3166

From another machine

nmap -p 3166 -sV <host>
sudo nmap -sU -p 3166 <host>
nc -zv <host> 3166

Block it in the firewall

sudo ufw deny 3166/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3166" -Direction Inbound -LocalPort 3166 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3166 used for?

Port 3166 is assigned by IANA to sossecollector (Quest Spotlight Out-Of-Process Collector).

Is port 3166 TCP or UDP?

Port 3166 is registered for TCP and UDP.

Is it safe to open port 3166?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 3166 is open?

On Linux run "ss -ltnup 'sport = :3166'", on macOS "lsof -nP -i :3166", and on Windows "netstat -ano | findstr :3166" to see the local process. From another machine, "nmap -p 3166 <host>" shows whether it is reachable.

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